I did a news search to see what researchers are saying recently about the data analyzed by 23andMe. One news article led me to a company blog post by a bioinformatics researcher, Gabe Rudy, "GATK is a Research Tool. Clinics Beware"
http://blog.goldenhelix.com/?p=1534
in which he applied his own industry knowledge to his updated 23andMe report. His conclusions suggest that the product needs much more work:
"I promptly sent an email off to 23andMe’s exome team letting them know about what is clearly a bug in the GATK variant caller. They confirmed it was a bug that went away after updating to a newer release. I talked to 23andMe’s bioinformatician behind the report face-to-face a bit at this year’s ASHG conference, and it sounds like it was most likely a bug in the tool’s multi-sample variant calling mode as this phantom insertion was a real insertion in one of the other samples."
. . . .
"But because GATK has been used so prolifically in publications and is backed by the Broad Institute, it can be viewed as a 'safe' choice. As small labs and clinical centers around the world are starting to set up their DNA-seq pipelines for gene panel and exome sequencing, they may choose GATK with the assumption that the output doesn’t need to be validated.
"And that would be a mistake.
"GATK is as susceptible to bugs as much as any complex software. Their new mixed licensing model (free for academic, fee for commercial) is intended to add more dedicated support resources to the team. I suggest they think about adding dedicated testers as well."
So for those of us following along at home, the crucial idea is that most of the "information" that 23andMe provides paying clients has not been validated. Not only has it not been validated as to correctness of the genome analysis software (the industry scientist's observation), it has even less been validated as a clue to clinically significant disease risk for the majority of diseases that afflict people in developed countries. Pay your money for the service at the new lower price if you like, but prepared to see your personal genome results repackaged and reinterpreted for years to come before you learn anything from them that will help you improve your health.